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(No Model.)

F. W. DAVENPORT.

OUTLINE TRANSFER TOOL. No. 362,724. Patented May 10, 1887.

[ml/BUMP WNW/35555 UNITED STATES PATENT. OFFICE.

FRANK XV. DAVENPORT, OF PROVIDENCE, RHODE ISLAND.

OUTLINE-TRANSFER TOOL.

SPECIFICATION forming part of Letters Patent NO. 362,724, dated May 10, 1887.

Application filed August 31, 1885. Serial No. 115,863.

To aZZ whom it may concern:

Be it known that I, FRANK W. DAVENPORT, of the city and county of Providence, State of Rhode Island, have invented certain new and useful Improvements in Outline Transfer Tools; and I hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specification.

This invention relates to an instrument which will conform to and retain the outline of any irregular surface against which it is pressed to be used for reproducing such out line upon a new surface.

Figure 1 is a top view of the instrument with a portion broken away to show the arrangement of the spring. Fig. 2 is asection through the line a x of Fig. 1. Figs. 3 and 4 show modified forms of the instrument.

A represents rods or arms, which are preferably uniform in shape and size. They are placed side by side until a sufficient number have been employed to produce the required length of the instrument. Said rods are held in such position by means of a frame or base, B, which may be of any convenient form, its object being to hold them parallel and admit of a sliding movement in the direction of their length.

A convenient form of frameis shown in Fig. 1, which consists of four thin crossbars, two of which are shown at B B. These cross-bars are connected at their ends by blocks 0 O, which hold them far enough apart to admit the rods.

A Very important part of this invention consists in the manner of holding the rods in the frame, which is shown in Fig. 1. It consists of a spring, D, which presses the rods to gether sidewise, thus insuring a positive hold upon each individual rod and a uniformity of resistance in the whole series to any force tending to move them. Said spring is furthermore supplemented by a setscrew, E, for increasing or diminishing the hold of the spring upon the rods, and can be set up so as to hold them immovably, if so desired.

(No mom 1.)

In practice it is often necessary to take an outline representing a large part of a circle, as shown in Fig. 3. This has always been difficult, and as the above tool will not readily conform to such outline I provide the tool shown at Fig. 3. This is made with an angular frame in place of the straight one, each straight side of which has its own set of rods and spring. This tool is thought to be an im provement on the straight one for certain kinds of work.

Fig. 4 shows one among several other forms of rods that may be employed. In this case they are provided with slots, and are held together by a central base-piece which passes through said slots.

The method of using this instrument is by pressing the ends of the rods into contact with the surface it is desired to reproduce. They will conform to any irregularities, and can be afterward used for laying out the same upon a new surface.

By means of this tool a large saving in time will be effected, and work which has hereto fore given more or less trouble will be rendered comparatively easy.

Having fully described my invention. What I claim as new, and desire to secure by Letters Patent, is-

1. In an outlinetransfer tool, aseries of rods arranged in or 011 a frame and acted upon by spring-pressu re to hold them together, and thus offer more or less resistance to any force tending to move them.

2. In an outline-transfer tool, a series of rods arranged in or on a frame and acted upon by spring-pressure to hold them together, in combination with a set-screw for increasing or diminishing said spring-pressure.

3. In an outline-transfer tool, two or more series of sliding rods arranged in or on an angular frame and operating substantially as and for the purpose set forth.

FRANK W. DAVENPORT.

Vitnesses:

JAMES A. POTTER, L. B. DAVENPORT. 

